<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>Document</title> 
  <script src="vue.js"></script>
</head>
<body>
  <div id="app">
    <a href="#" @click.prevent="comName='login'">登录</a>
    <a href="#" @click.prevent="comName='register'">注册</a>
    <component v-bind:is="comName"></component>
  </div>
  <script>
    Vue.component('login', {
      template: '<div>登录页面</div>'
    })
    Vue.component('register', {
      template: '<div>注册页面</div>'
    })
    var vm = new Vue({
      el: '#app',
      data: { comName: '' }
    })
 </script>
</body>
</html>